Full Flaps

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Full Flaps

Postby jtaylor » Mon Oct 01, 2012 8:53 pm

Hi all. We are 5 hours into testing, having a weird problem. We cannot get full (45) flaps if you are in the upper part of the white arc. It's like the handle won't catch the top slot. We cannot duplicate on the ground. I know the POH says full flaps on short, but seems strange. Anybody else have that happen?
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Re: Full Flaps

Postby jak » Mon Oct 01, 2012 9:17 pm

j taylor call me tomorrow at the shop. Jak
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Re: Full Flaps

Postby bluemax » Tue Oct 02, 2012 7:26 am

j Taylor,

When Jak tells you what's wrong, please post it here. We all want to know!
Max Rentz
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Re: Full Flaps

Postby danerazz » Tue Oct 02, 2012 9:48 am

Is the flap handle flexing and binding on the "button" rod, preventing it from engaging?
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Re: Full Flaps

Postby jak » Tue Oct 02, 2012 8:02 pm

I don't mind telling everyone I just don't type well enough to put all out here if anyone wants to call me I will tell it all and you can post it here its a simple fix. Jak
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Re: Full Flaps

Postby jtaylor » Sun Oct 07, 2012 8:20 pm

OK, talked to Jak, here is the fix. It has to do with the air pressure force on the flaps pulling the cable and the flex of the flap handle. I guess it gets in some kind of bind. Pull the flap handle assembly out of the airplane, disassemble to get the side plates by themselves. Bolt the side plates together so the clearance is the same on both plates. You will be removing material from the edge of the slot opposite the ratchet slots. The removed material will be crescent shaped, sharp at the bottom, getting to about 1/8" wide at the top. See attatched picture, sharpie marked area is what is to be removed. I made the mod today, but have not flight tested it. Thanks Jak.
Attachments
DSC02242.JPG
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Re: Full Flaps

Postby jak » Mon Oct 08, 2012 7:14 am

Hey J that may be a little aggresive and carry all the way around the top. Jak
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Re: Full Flaps

Postby taildrgfun » Tue Oct 09, 2012 10:26 am

Another thing that will help immensly is to put on the flap gap seals and VG's. It takes both of them together to really make a big difference. Without them the air on the top of the deployed flap is a turbulent mess. With them it makes the air flow over the top of the flap and you will be amazed how much easier and better your flaps will work.

I know some don't want those ugly VG's in the way when they wash their plane but the gap seals don't work very well without the VG's.
Steve Henry, Wild West Aircraft
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Re: Full Flaps

Postby taildrgfun » Tue Oct 09, 2012 10:33 am

Jak is right about what he said, I for sure do that on mine too, but if you really want your flaps to work their best and want to be able to land slower, add the seals and VG's as well.
Steve Henry, Wild West Aircraft
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Re: Full Flaps

Postby HS-JAT » Fri Nov 16, 2012 11:45 pm

jtaylor wrote:OK, talked to Jak, here is the fix. It has to do with the air pressure force on the flaps pulling the cable and the flex of the flap handle. I guess it gets in some kind of bind. Pull the flap handle assembly out of the airplane, disassemble to get the side plates by themselves. Bolt the side plates together so the clearance is the same on both plates. You will be removing material from the edge of the slot opposite the ratchet slots. The removed material will be crescent shaped, sharp at the bottom, getting to about 1/8" wide at the top. See attatched picture, sharpie marked area is what is to be removed. I made the mod today, but have not flight tested it. Thanks Jak.


Did you flight test this yet?
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Re: Full Flaps

Postby danerazz » Sat Nov 17, 2012 8:48 pm

What about stiffening up the handle so it doesn't flex as much? The plate-mod seems like a solution that attacks the symptom rather than the problem.
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Re: Full Flaps

Postby HS-JAT » Mon Mar 25, 2013 9:42 pm

I had the same problem with the last notch of flaps not locking in place. Enlarged the slot for the full flap position IAW what was reccomended in this thread, and they work great now. Solid lock

Before and after shots
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2013-02-27-0488.jpg
2013-02-27-0486.jpg
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Re: Full Flaps

Postby User GDS » Wed Mar 27, 2013 9:54 am

I'm having the same problem with the 3rd notch of flaps. I took it apart and opened up that area, but they still won't catch. I can feel the detent, but it won't lock.

I removed a "short" 1/8" of material, leaving the line. When I get motivated to take it apart and redo it, I guess I'll take another 1/6".

What happens if you take too much material?

I don't think I'll miss the 3rd notch of flaps during the first ~10 hours of flying.
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Re: Full Flaps

Postby HS-JAT » Wed Mar 27, 2013 10:12 am

User GDS wrote:I'm having the same problem with the 3rd notch of flaps. I took it apart and opened up that area, but they still won't catch. I can feel the detent, but it won't lock.

I removed a "short" 1/8" of material, leaving the line. When I get motivated to take it apart and redo it, I guess I'll take another 1/6".

What happens if you take too much material?

I don't think I'll miss the 3rd notch of flaps during the first ~10 hours of flying.


I don't think this mechanism is any piece of precision engineering. If you look at what my original "Notch" looked like, it is pretty easy to gather why that cross bolt could not seat securely.

I must say, that now I have confidence in my full flap setting staying locked in. I think the plane flies a much better approach and landing with full flaps.
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Re: Full Flaps

Postby taildrgfun » Wed Mar 27, 2013 10:42 am

I know I'm repeating myself here but the other thing to do to really make your flaps work good is to put on the flap gap seals and vortex generators. You will be amazed at how much better, easier to engage, and more efficient your flaps will be. Your take offs will be shorter, climb outs steeper, landings slower.

The seals by themselves are not that great, but with VG's they are the cheapest, easiest, best thing you can do to a Highlander wing.
Steve Henry, Wild West Aircraft
(the Dead Stick Take-off Guy)
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